JP3112752B2 - How to connect a cordless phone extension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extension of a cordless telephone which reduces the occurrence of communication failure due to poor communication at the time of extension connection between slave stations of a parent-child cordless telephone comprising a master station and a plurality of slave stations. Regarding connection method.

[0002]

2. Description of the Related Art A so-called cordless telephone comprising a master station connected to a general subscriber telephone network and a slave station connected to the master station by a specified low-power radio, as shown in FIG. And the slave station 2 are each provided with a radio transmission device 3, a radio reception device 4, and a control device 5, and the control device 5 is provided with a call name storage device and a carrier sense means, so that the control channel Communication between stations is performed by the MCA method using automatic switching of a communication channel.

[0003] Here, the carrier sense is a function of not transmitting a radio wave at the frequency (channel) when a radio wave of another station is received before trying to connect with a partner.

Some of such cordless telephones have a plurality of slave stations 2 and allow extension calls between the slave stations 2. A connection procedure for calling an extension between the slave stations 2 is known. Conventionally, as shown in FIG. 5, when a calling signal 50 for an extension request is transmitted from an originating slave station A using an available control channel selected by carrier sense, the signal is received and a master is received. The station 1 designates the communication channel 51 to the calling-side slave station A and the called-side slave station B by carrier sense. Then, the called-side slave station B outputs the tone ringer tone 54, while the calling-side slave station A outputs the ringing tone 52 from the receiver. Next, when the called-side slave station 2 enters the off-hook state 55 for a response, stops the tone ringer sound 56, and sends the terminal response signal 53, the calling-side slave station 1 stops the ringing tone 58, and the slave stations A , B are connected to each other, and the communication state 59 is set.

[0005]

However, in the extension calling method based on the connection procedure described above, if the transfer of the terminal response signal sent from the called side to the calling side slave station by the master station does not go well, the called side slave station becomes In some cases, the ringing tone continues to be output from the calling slave station even during a call, and the phone does not enter the call state. This phenomenon is a major problem because the radio waves used are weak and occur at a high probability. It has become.

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to make a call between a calling slave station and a called slave station even when transfer of a terminal response signal to the calling slave station is not successful.

[0007]

In order to solve the above-mentioned problems, according to the present invention, an extension connection between cordless telephone slave stations is established by a calling signal of a calling slave station. After the communication channel with the slave station is specified, the two slave stations are connected to each other in a call state, and a tone ringer sound output from the called slave station by a calling signal from the calling slave station is output by the calling channel to the calling slave station. , And output it as a ringing tone, and use a method of stopping the output and transmission of the tone ringer sound by the called-side slave station by off-hook.

[0008]

In a cordless telephone using such a method,
When the communication channel is designated by the master station by transmitting a call signal from the calling slave station, the calling slave station and the called slave station immediately leave the control of the master station and immediately return to the called slave station. Without transmitting a terminal response signal indicating the on-hook state. Also, at this time, the ringing tone output from the calling side slave station is such that the tone ringer sound output from the called side slave station is transmitted to the calling side slave station as a voice signal using a communication channel, and the ringing tone is output from the calling side slave station. Output. Therefore, at the time of off-hook, the receiving-side slave station only stops the tone ringer sound, the ringing tone of the calling-side slave station also stops, and a call can be made between the slave stations without transmitting / receiving a terminal response signal.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

As shown in FIG. 1, a cordless telephone according to this embodiment includes a master station 1 connected to a general subscriber's telephone network, and a plurality of slave stations 2 connected to the master station 1 by a specified low-power radio.
It consists of

As shown in FIG. 2 and FIG. 3, the master station 1 and the slave station 2 are provided with a radio transmitting apparatus 3 and a radio receiving apparatus 4 each having a PLL local oscillation circuit whose oscillation frequency is changed by setting frequency data. Control device 5 for performing a connection procedure with a station
And

The control device 5 comprises an ID-ROM 10 provided as a call name storage device and a microprocessor 11 having functions such as carrier sense and line connection procedures. 3 and the wireless receiver 4 via a modem 12 so that transmission and reception of control data such as communication channel data with a partner station can be performed.

Similarly, the microprocessor 11 is connected to the PLL local oscillation circuits of the radio transmission device 3 and the radio reception device 4 by the control bus 13, and the microprocessor 11 can set the transmission and reception frequencies of the control channel and the communication channel. I can do it.

Further, the microprocessor 11 of the master station 1
Is connected to the communication network controller 14 and also controls connection with the general subscriber telephone network.

On the other hand, the microprocessor 11 of the slave station 2 is connected to an input dial 15 and a sounding body 16 for outputting a tone ringer sound in order to control a telephone circuit such as dial input and output of a tone ringer sound. .

The transmitter 3 and the receiver 4 of the slave station 2 respectively include a transmitter 17 and a receiver 18 with an amplifier 19,
After the communication channel is set by the microprocessor 11, the microprocessor 11 can communicate on the set communication channel. Further, the receiver 18
The amplifier 19 of the microprocessor 11, for example,
The timer output is connected to the microprocessor 11
Can output a dial tone directly to the receiver 18. In addition, on-hook detecting means 20 for detecting off-hook is connected to the microprocessor 11 of the slave station 2.

The cordless telephone of this embodiment is configured as described above. Next, a method for connecting extensions between the slave stations 2 will be described.

For example, as shown in FIG. 1, when an extension connection is made from a slave station C on the transmitting side to a slave station D on the receiving side,
As shown in FIG. 4, the microprocessor 11 of the control device 5 of each station performs control according to the following sequence.

That is, when the waiting slave station C sends a call signal to the master station 1 via the control channel set by the carrier sense (100), the master station 1 receiving the call signal transmits the call signal. The communication channel between the slave station C and the called slave station D is designated by carrier sense (101), and control is transferred to the called slave station D. In this way, the calling-side slave station C and the called-side slave station D whose communication channels are designated are connected, and immediately transition to a talking state (102). At the same time, the called-side slave station D outputs a tone ringer sound (103), transmits the tone ringer sound as a voice signal to the calling-side slave station C via a communication channel (104), and transmits the transmitted tone ringer sound. In the slave station C, the handset 18 outputs a ringing tone (105).

At this time, the receiving-side slave station D goes off-hook because of the response (106). When the off-hook is detected and the receiving-side slave station D stops outputting the tone ringer sound (107), the calling-side slave station D is activated. Since the ringing sound of C is also stopped, a call between the transmitter 17 and the receiver 18 can be made between the slave stations C and D (108).

As described above, the slave stations C and D which make an extension connection according to the extension connection procedure have a poor communication condition, such as those used in a place such as a boundary area of a communication distance.
Even if the terminal response signal cannot be transmitted / received, if the receiving-side slave station D stops the tone ringer sound by going off-hook, the ringing tone of the calling-side slave station C is reliably stopped. A call disabling state in which a ringing tone from the calling side slave station C is continuously output due to a mistake does not occur.

[0022]

According to the present invention, the ringing tone of the originating slave station can be stopped by the above-described extension connection method without using control data transmission by the terminal response signal indicating the off-hook state of the called slave station. Since it is possible, it is possible to eliminate the occurrence of communication failure in which a ringing tone continues to be output from the calling side slave station due to a communication failure due to a data transmission error or the like, and it is possible to reduce poor connection between slave stations.

At this time, the control for connection between slave stations is also simplified, so that the development cost of software for the control can be reduced.

[Brief description of the drawings]

FIG. 1 is an operation diagram of an embodiment.

FIG. 2 is a block diagram of a master station.

FIG. 3 is a block diagram of a slave station.

FIG. 4 is a connection sequence of the embodiment.

FIG. 5 shows a conventional connection sequence.

FIG. 6 is a block diagram of a cordless telephone.

[Explanation of symbols]

 Reference Signs List 1 master station 2 slave station 3 wireless transmitter 4 wireless receiver 5 controller 100 call signal 101 communication channel designation 102 communication state 103 tone ringer 104 tone ringer sound transmission 105 ringing sound by tone ringer 106 off hook 107 tone ringer sound stop C, D slave station

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-205949 (JP, A) JP-A-4-233834 (JP, A) JP-A-4-213933 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (1)

(57) [Claims] A master station and a plurality of slave stations each comprising a wireless transmitting / receiving apparatus, and a control apparatus for performing a connection procedure between the wireless transmitting / receiving apparatus and a partner station by automatically switching a communication channel using a control channel based on the MCA method. In the cordless telephone consisting of: after the calling signal of the originating slave station, the master station is connected to the calling state between the slave stations after specifying the communication channel between the calling slave station and the called slave station, and A tone ringer sound output by the called slave station based on a call signal from the calling slave station is transmitted to the calling slave station via the communication channel and output as a ringing tone. Method of connecting a cordless telephone to stop output and transmission.